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- 10 -
Operation
(Continued)
Microphone
1. PTT SWITCH: The Push-To-Talk (PTT) switch controls the transmit
and receive function of the radio. Push to transmit and release to
receive.
2. REMOTE UP/DOWN SWITCH: The digit on the frequency display
above the SHF “cursor” can be stepped up or down by pushing either
of these buttons.
For best results, the user should select a low-impedance dynamic type
microphone or a transistorized microphone.
The microphone should provide the functions shown in schematic below.
6 WIRE MIC CABLE
Pin Number Mic Cable Lead
1 Audio Shield
2 Audio Lead
3 Transmit Control
4 Receive Control
5 Up Control
6 Down Control
Transceiver Microphone Schematic Diagram
- 11 -
Operation
(Continued)
Frequency Selection
Frequency selection in the
RCI-2950DX/2970DX-150
can be
accomplished
using any one of the following three methods:
1. The first method of frequency selection uses the SHF (Shift) key and
the (UP)/ (DOWN) keys located on the front panel. To accomplish
this, press the SHF key until the display cursor on the frequency
display is positioned under the frequency digit that is to be changed.
Use the” ” key to increase the number. Press the “ ” key to
decrease the number. Perform the steps described above for each digit
until the desired frequency is displayed in the LCD frequency display
window.
2. The second method of frequency selection is performed using the SHF
key and the FREQUENCY select knob located on the front panel. Use
the SHF key in the manner described above to select the digit to be
changed. Then rotate the FREQUENCY selector clockwise to increase
the frequency and counterclockwise to decrease the frequency.
3. The third method of frequency selection is through the use of the SHF
key and the remote UP and DOWN buttons located on the microphone.
Frequency selection by this method is accomplished in the same
manner as with the “ ” key and the “ ” key on the front panel
keypad.
Sometimes when receiving more than one station on a fixed frequency
such as on a “Net” or “round table” operation, it is convenient to be able
to vary the receive frequency slightly without changing the transmit
frequency. To do this, rotate the clarifier control while an off frequency
station is transmitting. You can vary the receiver frequency by ±2.5 KHz
for clearest voice reception. The clarifier can be optionally modified to
vary both Transmit and Receive frequencies together.